Improvement in pruning-sh ears



UNITED STATES PATENT CEEICE.

ADAM BAUMANN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN PRUNlNG-SHEARS.

Specification forming part of Letters Patent No. 55,0413, dated May 29, 1866.

To all whom #It may concern.'

Be it known that I, ADAM BAUMANN, ot Philadelphia, Pennsylvania, have invented an Improvement in Pruning-Shears; and I do hereby decla-re the following to be a full, clear, and exact description of the same, reference being had to the aeeompanyin g drawings and to the letters of reference marked thereon.

My invention consistsof a rod and spiral sprin g combined with and adapted to the hooked portion and knife of pruning-shears, substantially as described hereinafter, the spiral spring havingmore elasticity than the hat or curved springs hitherto used, and permitting amore extended movement of the knit'e and the use of the instrument on larger branches.

In order to enable others to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figures l and 2 are side views ot' my improved prun4 ing-shears, a-nd Fig. 3 a plan view.

The hookedportion A ofthe shears is provided with the usual socket a for attach ment to a suitable pole or handle, and to one side ot' the hook the knife B is hinged by means ot' a pin, b, the knit'e being provided with a steel cutting-edge, x, and having the usual arm d, to an eye at the end ot which is secured the operating-cord. To a lug on this arm is jointed the upper end ot' a rod, D, the lower end of which passes through and is guided by a projection, e, at or near the upper portion of the socketa., and between this projection and a collar, f, on the socket intervenes a spiral spring, It, which is coiled round the rod. On one side ot' the hooked portion of the instrument is a projection, t, which serves as a stop to limit the movement ot' the knit'e B and its arm d. In ordinary spring-shears the hinged knife is operated when the oord is released by a fiat or curved spring, the elasticity of which is so limited that Ithe movement of the knife must have a corresponding` limitation. Hence it can be used only for severing` the smaller branches of trees. As the spiral spring It is capable of yielding to a greater extent than a dat or curved spring, it will be evident that a more extended movement ot' the knife may be obtained, and that branches of' greater dimensions may consequently be severed by the instrument.

The spiral spring is, moreover, less liable to breakage than the ordinary at or curved spring.

I claim as my il'ivention and desire t0` secure by Letters Patent- The rod D and its spiral spring l1., combined with and adapted to the hooked portion and knife of pruning-shears, substantially as and for the purpose herein set forth.

In testimony whereofI have signed my name to this specifica-tion in the presence of two subscribing witnesses.

ADAM BAUMANN.

Witnesses:

GHAs. B. PRICE, H. HoWsER. 

